global opts_mgroups span erepeat(\cmidrule(l{3pt}r{3pt}){@span}) embs_prefix(\multicolumn{@span}{c}{) suffix(})
global opts_esttab star booktabs label /* nomtitles nodepvars */  nonotes nogaps  ///
	posthead(\midrule \midrule) substitute(\_{ _{) 
	
